<template>
  <view>
    <view class="search-box">
      <uni-search-bar :radius="100" @confirm="search" @input="input" cancel-button="none"></uni-search-bar>
    </view>
    
    <!-- search建议列表 -->
    <view class="sugg-list" v-show="searchResults.length !==0">
      <view class="sugg-item" v-for="(item,i) in searchResults " :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
        
      </view>
      
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-show ="searchResults.length===0">
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
         <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      
      <!-- 列表区域 -->
      <view class="history-list">
         <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view >
    
    
   
  </view>
</template>

<script>
  export default {
    data() {
      return {
        
        timer:null,
        kw:'',
        //搜素的结果
        searchResults :[],
        
        //搜索历史数组
        historyList:[]
        
        
      };
    },
    onLoad() {
      //加载本地存储的历史搜索记录
      this.historyList = JSON.parse(uni.getStorage('kw')||'[]')
    },
    methods:{
      input(e){
        //清除timer对应的延时器
       clearTimeout(this.timer)
       
       //重启动一个延时器，并把ID赋值给timer
       this.timer = setTimeout(() =>{
         
         //如果500毫秒内，没有触发新的事件，则将输入的值赋给kw
          this.kw=e
          
          this.getSearchResults()
        },500)
      },
      async getSearchResults(){
        if(this.kw.length===0){
         this.searchResults=[]
         return
        }else{
          const {data:res}= await uni.$http.get("/api/public/v1/goods/qsearch",{query:this.kw})
          if(res.meta.status!==200) return uni.$showMsg()
          this.searchResults =res.message
          
         // this.saveSearchHistoryList()
          //1.将Array数组转化为Set对象
          const set = new Set(this.historyList)
          //2.调用Set对象的delete 方法，移除对应的元素
          set.delete(this.kw)
          //3.调用Set对象的add 方法，向Set 中添加元素
          set.add(this.kw)
          //4.将Set对象转化为Array数组
          this.historyList = Array.from(set)
          
          //对搜索历史持久化存储
          uni.setStorageSync("kw",JSON.stringify(this.historyList))
        }
      },
      gotoDetail(item){
        uni.navigateTo({
          url:"/subpkg/goods_detail/goods_detail?goods_id="+item.goods_id
        })
      },
      saveSearchHistoryList(){
        this.historyList.push(this.kw)
      },
      clean(){
        this.historyList=[]
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:"/subpkg/goods_list/goods_list?query="+kw
        })
      }
    },
    computed:{
      histories(){
        //基于原来的数组得到一个反转的新数组，再把新数组渲染到搜索历史
       return  [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box{
    //设置定位效果为吸顶
    position: sticky;  //将搜索固定到页面最顶端
    top: 0;//吸顶位置顶部0
    z-index: 999; //防止轮播图覆盖搜索框
  }
  .sugg-list{
    padding: 0 5px;
    
    .sugg-item{
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display:flex;
      align-items: center;
      justify-content: space-between;
      
      .goods-name{
        //文字不允许换行（单行文本）
        white-space: nowrap;
        //溢出部分隐藏
        overflow: hidden;
        //文本溢出后，使用 月代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
      
    }
  }
  .history-box{
    padding: 0 5px;
    .history-title{
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    .history-list{
      display: flex;
      flex-wrap: wrap;
      .uni-tag{
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
